package com.atguigu.gulimall.ware.service.impl;

import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.exception.NoStockException;
import com.atguigu.common.to.mq.OrderTo;
import com.atguigu.common.to.mq.StockDetailTo;
import com.atguigu.common.to.mq.StockLockedTo;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;
import com.atguigu.common.utils.R;
import com.atguigu.gulimall.ware.dao.WareSkuDao;
import com.atguigu.gulimall.ware.entity.WareOrderTaskDetailEntity;
import com.atguigu.gulimall.ware.entity.WareOrderTaskEntity;
import com.atguigu.gulimall.ware.entity.WareSkuEntity;
import com.atguigu.gulimall.ware.feign.OrderFeignService;
import com.atguigu.gulimall.ware.feign.ProductFeignService;
import com.atguigu.gulimall.ware.service.WareOrderTaskDetailService;
import com.atguigu.gulimall.ware.service.WareOrderTaskService;
import com.atguigu.gulimall.ware.service.WareSkuService;
import com.atguigu.gulimall.ware.vo.OrderItemVo;
import com.atguigu.gulimall.ware.vo.OrderVo;
import com.atguigu.gulimall.ware.vo.SkuHasStockVo;
import com.atguigu.gulimall.ware.vo.WareSkuLockVo;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import lombok.Data;
import org.apache.commons.lang.StringUtils;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;


@Service("wareSkuService")
public class WareSkuServiceImpl extends ServiceImpl<WareSkuDao, WareSkuEntity> implements WareSkuService {

    @Autowired
    WareSkuDao wareSkuDao;
    @Autowired
    WareOrderTaskDetailService wareOrderTaskDetailService;
    @Autowired
    WareOrderTaskService wareOrderTaskService;
    @Autowired
    RabbitTemplate rabbitTemplate;
    @Autowired
    ProductFeignService productFeignService;
    @Autowired
    OrderFeignService orderFeignService;


    private void unLockStock(Long skuId, Long wareId, Integer num, Long taskDetailId) {
        //库存解锁
        wareSkuDao.unlockStock(skuId, wareId, num);
        //更新工作单的状态
        WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity();
        entity.setId(taskDetailId);
        entity.setLockStatus(2);//变为已解锁
        wareOrderTaskDetailService.updateById(entity);
    }

    @Override
    public PageUtils queryPage(Map<String, Object> params) {

        QueryWrapper<WareSkuEntity> wrapper = new QueryWrapper<>();
        String skuId = (String) params.get("skuId");
        if (StringUtils.isNotEmpty(skuId)) {
            wrapper.eq("id", skuId)
                    .or().like("sku_id", skuId);
        }
        String wareId = (String) params.get("wareId");
        if (StringUtils.isNotEmpty(wareId)) {
            wrapper.eq("ware_id", wareId);
        }
        IPage<WareSkuEntity> page = this.page(
                new Query<WareSkuEntity>().getPage(params), wrapper);

        return new PageUtils(page);
    }

    @Transactional
    @Override
    public void addStock(Long skuId, Long wareId, Integer skuNum) {
        //1、判断如果还没有这个库存记录，那么就新增
        List<WareSkuEntity> entities = wareSkuDao.selectList(new QueryWrapper<WareSkuEntity>().eq("sku_id", skuId)
                .eq("ware_id", wareId));
        if (entities == null || entities.isEmpty()) {
            WareSkuEntity skuEntity = new WareSkuEntity();
            skuEntity.setSkuId(skuId);
            skuEntity.setStock(skuNum);
            skuEntity.setWareId(wareId);
            skuEntity.setStockLocked(0);
            //TODO 远程查询sku的名字，如果失败，整个事务无需回滚
            //1、自己catch异常
            //TODO 还可以用什么办法让异常出现以后不回滚？
            try {
                R info = productFeignService.info(skuId);
                Map<String, Object> data = (Map<String, Object>) info.get("skuInfo");
                if (info.getCode() == 0) {
                    skuEntity.setSkuName((String) data.get("skuName"));
                }
            } catch (Exception e) {
                log.error("查询SKU名称失败，跳过设置名称", e); // 记录日志但继续执行
                // 不标记回滚，事务继续
            }

            wareSkuDao.insert(skuEntity);
        } else {
            wareSkuDao.addStock(skuId, wareId, skuNum);
        }


    }

    @Override
    public List<SkuHasStockVo> getSkuHasStock(List<Long> skuIds) {
        return skuIds.stream().map(skuId -> {
            SkuHasStockVo skuHasStockVo = new SkuHasStockVo();

            // 查询 SKU 总库存量
            Long count = baseMapper.getStkStock(skuId);

            // 处理 count 可能为 null 的情况
            boolean hasStock = (count != null && count > 0);

            skuHasStockVo.setSkuId(skuId);
            skuHasStockVo.setHasStock(hasStock);
            return skuHasStockVo;
        }).collect(Collectors.toList());
    }

    /**
     * 为某个订单锁库存
     * <p>
     * 库存解锁的场景：
     * 1、下订单成功，但是订单过期没有支付被系统自动取消；被用户手动取消。都要解锁库存
     * 2、下订单成功，库存锁定成功，接下来的业务调用失败，导致订单回滚
     * 之前锁定的库存就要自动解锁。
     *
     * @param vo
     * @return
     */
    @Transactional(rollbackFor = NoStockException.class)
    @Override
    public Boolean orderLockStock(WareSkuLockVo vo) {
        /**
         * 保存库存工作单的详情
         * 追溯
         */
        WareOrderTaskEntity taskEntity = new WareOrderTaskEntity();
        taskEntity.setOrderSn(vo.getOrderSn());
        wareOrderTaskService.save(taskEntity);

        //1、按照下单的收货地址，找到一个就近仓库，锁定库存
        // 1、找到每个商品在哪个仓库都有库存
        List<OrderItemVo> locks = vo.getLocks();
        List<SkuWareHasStock> collect = locks.stream().map(item -> {
            SkuWareHasStock stock = new SkuWareHasStock();
            Long skuId = item.getSkuId();
            stock.setSkuId(skuId);
            stock.setNum(item.getCount());
            // 查询这个商品在哪个仓库有库存
            List<Long> wareIds = wareSkuDao.listWareIdHasStock(skuId);
            stock.setWareId(wareIds);

            return stock;
        }).collect(Collectors.toList());
        Boolean allLock = true;
        //2、锁定库存
        for (SkuWareHasStock hasStock : collect) {
            boolean skuStocked = false;
            Long skuId = hasStock.getSkuId();
            List<Long> wareIds = hasStock.getWareId();
            if (wareIds == null || wareIds.isEmpty()) {
                // 没有这个商品的库存
                throw new NoStockException(skuId);
            }
            //1、如果每个商品都锁定成功，将当前商品锁定了几件的工作单记录发给MQ
            //2、锁定失败。前面保存的工作单信息就回滚了。已经发送出去消息，即使要解锁记录，由于去数据库查不到id，所以不用解锁
            //
            for (Long wareId : wareIds) {
                //成功返回1，失败返回0
                Long count = wareSkuDao.lockSkuStock(skuId, wareId, hasStock.getNum());
                if (count == 1) {
                    // 锁定成功
                    skuStocked = true;
                    //TODO 告诉 MQ 库存锁定成功
                    WareOrderTaskDetailEntity detailEntity = new WareOrderTaskDetailEntity(null, skuId, "", hasStock.getNum(), taskEntity.getId(), wareId, 1);
                    wareOrderTaskDetailService.save(detailEntity);
                    //发送消息
                    StockLockedTo stockLockedTo = new StockLockedTo();
                    stockLockedTo.setId(taskEntity.getId());

                    StockDetailTo stockDetailTo = new StockDetailTo();
                    BeanUtils.copyProperties(detailEntity, stockDetailTo);
                    //只发id不行，防止回滚以后找不到数据
                    stockLockedTo.setDetail(stockDetailTo);//只要有一个锁定成功，就发消息

                    rabbitTemplate.convertAndSend("stock-event-exchange", "stock.locked", stockLockedTo);
                    break;
                } else {
                    // 当前仓库锁失败，重试下一个仓库

                    //TODO 订单回滚，库存回滚
                    //TODO 订单服务创建订单，订单号
                    //TODO 库存服务扣减库存
                }
            }
            if (skuStocked == false) {
                throw new NoStockException(skuId);
            }
        }
        // 3、肯定全部都锁定成功了

        return null;
    }

    @Override
    public void unlockStock(StockLockedTo to) {


        Long taskId = to.getId();// 库存工作单的id
        StockDetailTo detail = to.getDetail();
        Long skuId = detail.getSkuId();
        Long detailId = detail.getId();
        //解锁
        //一、查询数据库关于这个订单的锁定库存信息
        //  1、有；证明库存锁定成功
        //      是否解锁看订单情况
        //          1、没有这个订单。必须解锁
        //          2、有订单。判断订单状态。
        //              1）、已取消，解锁库存
        //              2）、没取消，不解锁
        //
        //  2、没有；库存 锁定失败了，库存回滚了，无需解锁
        WareOrderTaskDetailEntity byId = wareOrderTaskDetailService.getById(detailId);
        //一、查询数据库关于这个订单的锁定库存信息
        if (byId != null) {
            //  1、有；证明库存锁定成功
            Long id = byId.getId();
            WareOrderTaskEntity taskEntity = wareOrderTaskService.getById(id);
            String orderSn = taskEntity.getOrderSn();
            //根据订单号查询订单的状态
            R r = orderFeignService.gatOrderStatus(orderSn);
            if (r.getCode() == 0) {
                // 订单数据返回成功
                OrderVo data = (OrderVo) r.getData(new TypeReference<OrderVo>() {
                });

                //订单不存在或订单已被取消，才能解锁库存
                if (data == null || data.getStatus() == 4) {
                    if (byId.getLockStatus() == 1) {
                        //  当前库存工作单详情状态为1，已锁定，才能解锁
                        unLockStock(skuId, detail.getWareId(), detail.getSkuNum(), detailId);
                    }
                }
            } else {
                //消息拒绝以后重新放回队列里，让别人继续消费解锁。（防止消息被一个拒绝后自动删除）
                throw new RuntimeException("远程服务失败");
            }
        } else {
            //无需解锁
        }

    }

    //防止订单服务卡顿，导致订单状态一直改不了，库存消息优先到期。查订单状态新建状态，什么都不做就走了
    //导致卡顿的订单永远不能解锁库存
    @Transactional
    @Override
    public void unlockStock(OrderTo to) {
        String orderSn = to.getOrderSn();
        //查一下最新的库存解锁状态，防止重复解锁库存
        WareOrderTaskEntity task = wareOrderTaskService.getOrderTaskByOrderSn(orderSn);
        Long id = task.getId();
        //按照工作单找到所有没有解锁的库存，进行解锁
        List<WareOrderTaskDetailEntity> detailEntities = wareOrderTaskDetailService.list(new QueryWrapper<WareOrderTaskDetailEntity>()
                .eq("task_id", id)
                .eq("lock_status", 1));
        //解锁
        for (WareOrderTaskDetailEntity detailEntity : detailEntities){
            unLockStock(detailEntity.getSkuId(), detailEntity.getWareId(), detailEntity.getSkuNum(), detailEntity.getId());
        }
    }

    @Data
    static
    class SkuWareHasStock {
        private Long skuId;
        private Integer num;
        private List<Long> wareId;
    }

}


